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General Lab Equipment
Lab Water Purification Systems

How Water Purification Works & How We Save You Time & Money

Excedr’s leasing program is designed for labs. Request a lease estimate today and see how leasing can save you time and money.

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Water purification system diagram

Water is one of the most commonly used solvents in a life science laboratory.

General lab equipment

It is the basis for many buffers, reagents, and cell cultures, and is regularly used for washing and cleaning applications. This means the water you use in your lab needs to be as sterile as possible in order to prevent contamination. If you use tap water, you will want to meet every standard regarding water purity to ensure it is free of organics and ultra-pure.

While tap water is considered somewhat pure, there are some classes of contaminants that can create problems for many laboratory tasks. This can include a range of particulates such as colloids, bacterias, gases, inorganic ions like zinc, and organics like total organic carbon (TOC).

In fact, TOC is one of the most essential factors to measure for in your water, and remove using a water purification system. Meeting strict Total Organic Carbon (TOC) water standards requirements is extremely vital, and TOC testing is becoming increasingly standard in validated water purification systems. The United States Pharmacopeia (USP) and ASTM international list TOC as one of the key substances to test for in any purified water system.

There are four water grades, or types, that are used to classify the quality or purity of water:

  • Ultrapure water (type I)
  • General laboratory grade water (type II)
  • Primary grade water (type III)
  • Feed water

Each type of water has to undergo various processes to reach a specific standard of purity, including carbon filtering, microfiltration, reverse osmosis, and more. The water grade reflects which type can be used for in laboratories. In other words, water purity classification helps scientists choose the quality of water that fits their specific needs.

High purity water has many uses in clinical diagnostics and medical research, as well as pharmaceutical control and R&D. The semiconductor and engineering industries also benefit from water purification.

If water quality is important to your work, having the proper water purification system installed is paramount. These systems, often referred to as high flow water purification systems, remove chemical contaminants through various techniques, such as de-ionization (DI) and reverse osmosis, and can come equipped with ultraviolet (UV) treatment systems.

The system can also range in capacity, from high capacity single tanks to dual-tank setups, supplying up to 40 liters per minute (L/min). High flow lab water system are typically equipped to handle ordinary tap water or pretreated water for most required laboratory applications.

Applied Techniques & High Flow Water Purification System Price

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Water purification systems use a variety of techniques to filter water, which are often combined to maximize performance. Understanding the various techniques used can help inform you on which system is best suited for your application needs.

Here is a list of just a small portion of techniques used to purify water:


This is a commonly used method that creates distilled water, which is considered very pure. Distillation involves boiling water and condensing the vapors into a sterilized container, effectively leaving behind any solid contaminants. Many water systems available offer a distillation method.


This technique applies a chemical process involving a specific type of resin or polymer called ion-exchange resin. The insoluble matrix acts as a medium to deionize water. Applying this exchange allows for both anions and cations to be replaced with hydrogen and hydroxide ions.

This removes mineral ions like sodium, iron, calcium, sulfate, and chloride from the water. Once the dissolved minerals have been replaced, the new ions are combined to form water. This can also be accomplished using an inexpensive method called electrodeionization, a technology that utilizes electricity alongside ion-exchange resin and membranes to deionize water.

Carbon Filtering

This method applies activated carbon as a filter in the adsorption of impurities from an aqueous solution, effectively removing chemical elements like chlorine, particles such as sediment, and volatile organic compounds, organic chemicals that have high vapor pressure at room temperature. The pore structure of activated carbon works to trap any contaminant that needs to be removed.


Ultraviolet water purification is an extremely effective method for removing bacteria from water using germicidal ultraviolet light. The UV rays penetrate harmful pathogens in the water and destroy these microorganisms by disrupting their DNA.

Unlike water purification systems that use filtration to remove unwanted contaminants, UV treatment purifies the water without any use of filtration, so it is sometimes necessary to use both a filtration system and UV system to adequately treat water for use in experimentation. UV purification can treat water for a number of bacteria, including E. Coli, giardia, cholera, and hepatitis B.

Reverse Osmosis

This water purification process utilizes a partially permeable membrane to remove impurities. Applied pressure is used to overcome osmotic pressure in order to capture suspended and dissolved chemical contaminants as well as biological ones. This result occurs because the solute is retained on the pressurized side of the membrane while the pure solvent, in this case, water, is allowed to pass through to the other side.

Normally, the process of osmosis allows for a solvent to naturally pass through from an area of high water potential to low water potential, or solute concentration. By applying external pressure, this process is reversed. Reverse osmosis is used in conjunction with a variety of filtration methods that include microfiltration and ultrafiltration.

Ultrapure Water Purification System Leases to Fit Every Need

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Founder-Friendly Leases

Our lease agreements are founder-friendly and flexible, helping you preserve working capital, strengthen the cash flow of your business, and keep business credit lines open for expansions, staffing, and other crucial operational expenses and business development opportunities.

2-5 Year Lease Lengths

Leases range from 2 to 5 years. Length will depend on several factors, including how long you want to use the equipment, equipment type, and your company’s financial position. These are standard factors leasing companies consider and help us tailor a lease agreement to fit your needs.

Your Choice of Manufacturer

We don’t carry an inventory. This means you’re not limited to a specific set of manufacturers. Instead, you can pick the equipment that aligns with your business goals and preferences. We’ll work with the manufacturer of your choice to get the equipment in your facility as quickly as possible.

Maintenance & Repair Coverage

Bundle preventive maintenance and repair coverage with your lease agreement. You can spread those payments over time. Easily maintain your equipment, minimize the chances something will break down, repair instrumentation quickly, and simplify your payment processes.

End-of-Lease Options

At the end of your lease, you have multiple options. You can either renew the lease at a significantly lower price, purchase the machine outright based on the fair market value of the original pricing, or call it a day and we’ll come the pick up the equipment for you free of charge.

No Loan-Like Terms

Our leases do not include loan-like terms, which can be restrictive or harmful in certain situations. We do not require debt covenants, IP pledges, collateral,  or equity participation. Our goal is to maximize your flexibility. When you lease with us, you’re collaborating with a true business partner.

In-House Underwriting Process

Our underwriting is done in-house. You can expect quicker turnaround, allowing you respond to your equipment needs as they arise. We require less documentation than traditional lenders and financiers and can get the equipment you need in operation more quickly.